Duplicator



J. DURKIN DUPLICATOR Jan. 13, 1931.

Filed May 17, 1950 Patented Jan. 13, 1931 JAMES DURKIN, or rITrsBUneH,PENNSYLVANIA lnuriaentren Appncupn med May 17, 1930. ,serial No.453,159;

This invention relates to duplicating de vices and more m particular toduplicatorsj having a stationary lgelatinous printingv sur# face. I Y

The primary object of this invention is to provide a duplicator havingtwo stationary gelatinous working surfaces instead of but one suchsurface, as is now the case with du plicato-rs of this type on themarket.

Another object s to provide in a dupli# cator simple means for renewingor exchanging the stationary gelatinous working surfaces with speed andease.

A further object of this invention is to provide a duplicator having acanvas-backed stationary gelatinous working surface which may beadjusted as to position and tension. Yet another object of thisinvention is `the provision ofa duplicator which is `simple inconstruction and operation and which may be manufactured at relativelylow cost.

Additional features and advantages of this invention will appear in thefollowing description considered in. connection vwith `the accompanyingdrawing forming a part of this application, and in which:

Fig. l is a front elevation of my duplicator.

Fig. 2 is a sectional View taken substanV tially on line 2-2 in Fig. l.

Fig. 3 is a perspective view of the deviceA Figs. 4 and 5 are sectional,fragmentary,A

. cn the frame thereof.

Fig. 6 is a side elevation lof the clamping bar of the device.

Fig. 7 is an end View of Fig. 6.

Referring to the drawing, a duplicator built according to my inventioncomprises a Y Guide rails lor runners Gare securedv inV any desiredmanner on both' longitudinal sides Y, fl l :or-the base.` These runnersare wider thanl the thickness of the basev and extend at both sidesthereof to provide clearance space for the gelatinous lilin and vprotectthe latter against Contact and friction withxthe top of the table' ordesk upon.. which they device isV placed. These lrunners serve also asguides 1for'the sheets upon which printing VVis to be duplicated. Toprevent marring thef'surface of the table, etc., upon which theduplieator is used, A't is preferable to cover the top and bottoni sidesof the runners with a lin-y ing 7 of felt, or any other suitable anddesired material, which lining also keeps the duplicator' from slidingtoo freely on said table, etc.V Y

` The canvas-backed duplicating film is reclamping-bar comprises asubstantially cylin-V drical bar 10 havinga flat portion ll and acorrugated portionl2. At one end of the bar there is secured on the flatportion thereof the handle l-by means of which the clampingbar may berotated.

The winding roller consists of the cylindrical body portion 14, made ofwood or any other suitable and desired material, having a diainetr'aland longitudinal slot l5 into which one end of the duplicating film 5inserted. Oneend of the body p'ortien is secured by means of a pin 16 ina ferrulel having a centrally disposed Ltrunnion 18. The other end ofsaid body portion is also fastened by a pin connection 19 to anotherferrule 20, `to which are secured the ratchet-wheel 21 and the turningshaft 22, the latter provided with a turning handle 23. l

The clampingbar and the-winding roller are rotatably mounted 'insuitably apertured brackets 2li, 25 fastened by means of screws 26, orotherwise, to the outer lateral sides of the. runners 6.4 i

Upon the bracket 25 is rockably mounted a pawl 27 provided with aholdingelug 28 and normally held in yengagement with the Vns to bringits corrugation in engagement with, the gelatinous side of theduplicating film, whereby the latter is securely clamped. The

film is nowloosely Wrapped aboutV both flat able means to stretch saidfilm about said base,

and means Vto hold the film in stretched condition. v v

6. In a duplicator, a base; a fiexible stationary gelatinous duplicatingfilm; means to removably secure said film to expose its effectivesurface on two sidesof saidbase.;l means to stretch said film onthejbase, and; spacer means adapted to hold said film in spaced relationto the surface on which said duplicatoris positioned.

In testimony whereof I affix my signature.

Y JAMES DURKIN.

faces of the base l and the free end of the'. f7.2 y Y film is theninserted in the slot 15 0f the Windf f ing-roller. By rotating thelatter in the proper direction, the film may be stretched taut on thebase, and it will be held in this conditionbyv the agency of the ratchetand pawl mechanism fully described above.

To remove the duplicating film, the winding-roller is rotated backwardsby first pressing onthe lug 28of the pawl 27 to disengage the latterfroml its ratchet-wheel. This releases the tension in the film and, byrotating the clainping-bar out of engagement with the film, the lattermay be quickly removed. Y

Vhile I have illustratedherein the present construction of a novelduplicating device having two stationary gelatinous Working surfaces,instead of only one as heretofore available in the trade, itmay befounddesirable. after continued experience to make kslight changes in theconstruction and arrangement of the details of this invention, andIintend to include all such variations in this application, as fallwithin the scope of the appended claims. Y

I claim: Y l. In a duplicator, a base; a flexible stationary gelatinousduplicating film; means to` removably secure said film to expose itseffective surface on two sides of said base. Y

2. In a duplicator, a base; a flexible stationary gelatinous duplicatingfilm; and

means to removably secure said film to expose e its effective surface ontwo sides of said base;

3. In a duplicator, abase; a fiexible stationary gelatinous duplicatinglm; means to removably secure said film to expose its. effective surfaceon two sidesl of said base,Av

and means to stretch said film on said b-ase.

1l. In a duplicator, a base; a flexible stati onary gelatinousduplicating film; means to removably secure said film to expose-itseffectivesurface'on two sides of said base, and ad` f ljust-able meansto stretch said film about said base. l Y

5. In a duplicator, a base; a flexible sta.-

tionary gelatinous duplicating film; means to removably secure saidfilmto expose its e'ec.- tive'.A surface on; two' sides of, said. baseadjust.-

